JPS61147372A - Partial picture forming device - Google Patents

Abstract

PURPOSE:To take out partial picture data easily by setting background picture data to a reference one and transferring the partial picture data to partial picture memory from graphic one so as to compose a partial picture. CONSTITUTION:A microcomputer 1 for controlling a partial picture generating procedure,the partial picture memory 5 for storing the partial picture data, a video processor 2 for displaying and controlling a picture, a graphic memory 3 and a picture display part 4 are installed. The picture data composed of the background picture and the partial picture 7 is fetched into the graphic memory 3 from an external device, and the partial picture data 5 is transmitted with the background picture data as a reference one so as to compose the partial picture 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention captures image data consisting of a background image and a partial image from an external device into a graphic memory, extracts only the partial image from within the area of the graphic memory, and converts the partial image data to a graphic memory. The present invention relates to a partial image creation device.

BACKGROUND ART Conventionally, when creating partial image data from a graphic memory, the position and area of the partial image are specified and inputted by external operation while checking the image data on an image display section, and the specified area of the graphic memory is input. Only the partial image data is transferred from the partial image memory to the partial image memory.

Problems to be Solved by the Invention However, as described above, the position and area of a partial image must be specified in advance in the area of the graph ink memory each time by external operation, and this specification is troublesome. Furthermore, if the position or area of a partial image is incorrectly specified, the partial image will be distorted and a regular partial image cannot be created.

Means for Solving the Problems The configuration of the present invention includes a microcomputer (hereinafter referred to as μmC0N) that controls the partial image creation procedure, a partial image memory (hereinafter referred to as P-RAM) that stores partial image data,
Video processor (hereinafter referred to as VNP) that controls image display
), the graphics memory connected to this vnp (
G-RAM (hereinafter referred to as G-RAM) and an image display unit that displays image data, and instead of the processing procedure of specifying the position and area of a partial image by external operation, partial image data is created using the background image as reference data. This adds additional processing steps.

Effect By having the above-described configuration, the present invention can easily extract partial image data from the G-RAM by using the background data as reference data and sequentially comparing the area data of the G-RAM. .

EXAMPLE Hereinafter, an example will be described based on one drawing. FIG. 3 is a block diagram showing an embodiment of the partial image creation device of the present invention.

In FIG. 3, μmCO that processes the partial image creation procedure
N1, VDP2 for controlling image display; A G-RAM 3 that is connected to the vDP 2 and stores image data, an image display section 4 that displays image data, and calculates a partial screen area from within the area of the G-RAM 3, and transfers and stores the data in that area. It consists of P-RAMs.

FIG. 2 shows screen coordinates 6 when image data is associated with coordinates, where xo and yo are origin coordinates, x,.

yI indicates the maximum coordinate in each direction. A state in which a partial screen 7 is placed within the area of screen coordinates 6 and the partial screen area is calculated is shown. Further, the G-RAM 3 is composed of three memory sections corresponding to the three primary colors.

FIG. 1 is a flowchart showing the operation procedure of this embodiment, and the operation of this embodiment will be explained using this figure. First, in step a and step b, X in the y (n)th row in each memory section of the G-RAM 3. -Jc.

Compare the data between them and if they all match, that's it! / (n
The data in the first row is set as a reference value in each reference register. In step C, set y(nl to yo,
G-R in step 1 from step d until reaching y.
A data area of a partial image is calculated from each memory section of the AMs. At step d! /(X on line n1.

Compare the data up to x1 with the reference register.

If the comparison data and the reference value all match in Stay 7' a, it is assumed that the area is other than the partial image area, and the process proceeds to step j.

If there is no match, go to step f! / Before line (n), y
Determine whether data is set in the min buffer,
If not set, Y (n) in the ymin buffer.
Set the address of. Next, in step h and step 1,! / (in line n1. zmin, ziaa
Calculate x.

xo''-x, the address of the first mismatched data between them is JcIL, then the data is compared and the address of the matched data is xb, and the data before the 1.!/(n)th line (
, zmins, zmax). xllin)J
If aL, set xl to the buffer of xa+in.

Also, for zmax (, zb, go to JIIILX's buffer 1.
Set cb respectively. Next, proceed to step l. 1. If data is sectored in 31fin buffer in step j and step. ymax the address of V(n)
data and set it in the ymax buffer. At step l! / (Determine whether nl is the final number of rows, and if it is not the final number of rows, proceed to step d. If it is the final number of rows, proceed to step m. In step m, Jmin, zm&!, obtained in the previous section, , ymin, , ytaaX as a partial image area, and data in the area is transferred to the P-RAM 6.

Effects of the Invention As described above, according to the present invention, by sequentially comparing area data in the G-RAM 3 using background image data as reference data, it is possible to easily extract several types of partial image data of any size.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the same embodiment, and FIG. 2 is a G-
FIG. 3 is a block diagram of a partial image creation device showing the same embodiment. 1...Microcomputer (μmC0N),
2... Video processor (VDP), 3... Old graphics memory (G-RAM), 4...
・Image display section, 6... Partial image memory (P-RA
M), 6... Screen coordinates, 7. Old... Partial screen. Figure 2 7 painting

Claims (1)

[Claims] A microcomputer that controls a partial image creation procedure, a partial image memory that stores partial image data, a video processor that controls display of images, a graphic memory connected to the video processor, and an image display section that displays images. , importing image data consisting of a background image and a partial image from an external device into the graphic memory,
A partial image creation device that creates a partial image by using background image data as reference data and transferring partial image data from the graphic memory to the partial image memory.